WPF应用程序主线程出现COMException

WPF、Excel插件、c#、我有多个异步调用从主线程上的web服务获取数据，然后在回调，我会在Excel中绘制数据。我跟踪了回调，它们也在主线程上运行。但我仍然得到COMException 0x800AC472，谷歌，似乎这是一个多线程问题。

但我很困惑为什么会发生这种情况。我认为只有一个主线程，因为所有回调都在主线程上运行，没有理由有异常?

编辑:在主UI线程上，ribbon/button被点击，它会调用web service BuildMetaData，一旦它被返回，在它的回调MetaDataCompleteCallback中，另一个web服务调用被发送一旦它被返回，在它的回调DataRequestJobFinished中，它将调用plot在Excel上绘制数据。见下文

On Main UI class:
Btn_Click()
{
...
                       _reportObjs[index].GenerateReport();
}

关于GenerateReport的类

public void GenerateReport()
{
                Request.ParseFunction();
                Request.MetacompleteCallBack = MetaDataCompleteCallback;
                Request.BuildMetaData();
}
public void MetaDataCompleteCallback(int id)
{
            try
            {
                if (Request.IsRequestCancelled)
                {
                    Request.FormulaCell.Dispose();
                    return;
                }
                ErrorMessage = Request.ErrorMessage;
                if (string.IsNullOrEmpty(Request.ErrorMessage))
                {
                    _queryJob = new DataQueryJob(UnityContainer, Request.BuildQueryString(), DataRequestJobFinished, Request);
                }
                else
                {
                    ModifyCommentOnFormulaCellPublishRefreshEvent();
                }
            }
            catch (Exception ex)
            {
                ErrorMessage = ex.Message;
                ModifyCommentOnFormulaCellPublishRefreshEvent();
            }
            finally
            {
                Request.MetacompleteCallBack = null;
            }
} 

        public void DataRequestJobFinished(DataRequestResponse response)
        {
            Dispatcher.Invoke(new Action<DataRequestResponse>(DataRequestJobFinishedUI), response);
        }
        public void DataRequestJobFinished(DataRequestResponse response)
        {
            try
            {
                if (Request.IsRequestCancelled)
                {
                    return;
                }
                if (response.status != Status.COMPLETE)
                {
                    ErrorMessage = ManipulateStatusMsg(response);
                }
                else // COMPLETE
                {
                    // TODO: Convert this into factory pattern
                    var tmpReq = Request as DataRequest;
                    if (tmpReq == null) return;
                    new VerticalTemplate(tmpReq, response, IsOffice2003).Plot();
                }
            }
            catch (Exception e)
            {
                ErrorMessage = e.Message;
                MIMICShared.Helper.LogError(e);
            }
            finally
            {
                //if (token != null)
                //    this.UnityContainer.Resolve<IEventAggregator>().GetEvent<DataQueryJobComplete>().Unsubscribe(token);
                ModifyCommentOnFormulaCellPublishRefreshEvent();
                Request.FormulaCell.Dispose();
            }
        }

        on plot class
        public void Plot()
        {
        ... 
           attributeRange.Value2 = headerArray;
           DataRange.Value2 = ....
           DataRange.NumberFormat = ... 
        }